I'm currently using versions 2106 and 2103 of Horizon. There's no particular reason for using Horizon Client 8.3, but even now, some thin client terminals come pre-installed with versions like 8.1 or 8.3. By the way, the issue mentioned above occurs in both 2103 and 2106 versions. According to the compatibility table, I don't see any problem whether it's 8.1, 8.3, or the latest version. I posted it not from the perspective of the BU but from the customer's perspective. Because there are actually devices with older Horizon Clients pre-installed, I just wanted to remind to be mindful if unintentionally connected with such protocols.